I am sure it can't be 9 meters high, so it's 9m for width, 5m for long and 4.5m for height, Kuwait has an extremely hot climate, above 40c/104f is pretty average around noon, that is a ton of heat he needs to get rid off.

I would stay away from evaporative cooling because the humidity it generates is more harmful than the heat on those miners, I can't give you a detailed advice, but for a 300kva/240kw worth of mining gears we currently have 19 8000m3/h aka 4708cfm fans, 10 for exhaust and 9 for intake, they are moving a ton of air and the miners are doing just fine even in extremely hot days, all gears are set to manual fixed speed of 100% (5000-6000rpms), and of course, no overclocking, in fact a few them are underclocked during the summer.

You could use that as a reference, but none of the above was based on scientific facts, it was simply trial and error which eventually worked fine.